Island



(No Model.) G. U. MEYER.

ARBOR. No. 441,889. N Patented Dec. 2, 1890.,

WITH-E5525: INT/ENTER:

'MM JM arbor with detachable tubes and a detachable UNITED STATES PATENT OFFICE.

GEORGE U. MEYER, OF PROVIDENCE, RI'IODE ISLAND.

ARBOR.

SPECIFICATION forming part of Letters Patent No. 441,889, dated December 2, 1890.

Application filed September 9, 1890. Serial No. 364,463. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE U. MEYER, of Providence, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Arbors; and I hereby declare that the following is a full, clear, and exact description of. the same, reference being had to the accompanying drawings, forming part of this specification.

This invention has reference to an improvement in arbors adapted for drawing seamless tubes from sheets of metal.

The object of this invention is to so construct an arbor that a sheet of metal or corn position of metals may be drawn into a tube by the use of the ordinary draw-bench.

The invention consists in providing the arbor or draw-bar with a collar or cylindrical portion of largerdiameter than the draw-bar, so as to form a shoulder by which the sheet metal will be held while the portion of the metal extending beyond the cylindrical portion is drawn into a tube by drawing the arbor through the hole of a draw-plate.

The invention further consists in providing the arbor with a collar forming a guide for the arbor.

The invention also consists in providing the draw-hook, all of which will be more fully set forth hereinafter.

The improved arbor is designed for use in a new process for drawing seamless tubes from sheet metal or sheet metal plated with other metal, an application for a patent for which is filed of even date herewith.

Figure 1 is a perspective view of the arbor or draw-rod provided with a cylindrical collar near one end. Fig. 2 is a perspective view of a tube, showing the arbor within the tube, partly in broken lines. Fig. 3 is a perspective view of the arbor provided with a screwthreaded collar. Fig. 4 isa perspective view of the arbor having the cylindrical collar at the rear end of the draw-bar. Fig. 5 is a perspective view of the arbor provided with a cylindrical sleeve. Fig. 6 is a perspective view showing the arbor provided with a eylindrical sleeve and a tube drawn over the sleeve. Fig. 7 is a perspective View of the mandrel providedwith a tubular sleeve and a detachable draw-hook.

Similar numbers of reference indicate corresponding parts in all the figures.

In the drawings, 10 indicates the draw-bar, 11 the forward end of the draw-bar, and 12 the rear end of the same.

13 is a cylindrical collar, either permanently secured to the draw-bar 10 or held on the bar by resting against a shoulder formed by making the forward part 11 of the drawbar of less diameter thanthe rest of the drawbar, the collar 13 having a central hole closely fitting the smaller portion 11 and resting against the shoulder formed by the larger portion 10 of the draw-bar. The end 11 of the draw-bar is the end to which the grippingtongs or other drawing means are secured to draw the arborand the metal to be drawn into a tube through the holes in the draw-plate.

For the purpose of this description,the drawbar 10 and collar 13 are designated as the arbor. The collar 13 maybe secured near the forward end 11 of the draw-bar, as is shown in Figs. '1, 2, and 3, or near the rear end 12, as is shown in Figs. 4, 5, and 6, inwhich the cylindrical sleeve 14 is placed on the draw-rod 10, the rear end bearing against the collar 13. The cylindrical sleeves 11 may be tubes of any required diameter, bored out to form a close-sliding fit on the draw-bar. They may be split longitudinally to facilitatetheir withdrawal from the mandrel. \Vhen the sleeves 14 are cylindrical tubes having a close sliding fit on the draw-bar 10, then the collar 13 may be dispensed with and the tubular sleeve made to bear against the shoulder formed by making the end 12 of the draw-bar of greater diameter than the rest of the bar.

The collar 15 is represented in Fig. 3 as screw-threaded on the end 11 of the draw-bar 10. The object is to make the same collar serve the purpose of securing the disk of sheet-metal against the face of the disk 13. The essential offices of the collar 15 are to form a guide for the drawing of the arbor and metal through the holes in the drawplate and to hold the same concentric with the hole, and for these purposes the collar-15 is usually made of a diameter that will pass through the hole in the draw-plate and is bored out so as to slide over the end 11 of the draw-bar.

The number 16 indicates a d raw-hook screwthreaded into the forward end of the drawbar. As the hook can be screwed into the draw-bar through the hole in the drauuplate, the hook may be of any required size, since it does not have to pass through the hole in the draw-plate. The guide-disk 15 may be placed on the straight end of the hook, so as to guide the arbor concentric with the hole in the die-plate.

In using the arbor a disk of sheet metal is perforated in its center with a hole through which the end 11 of the arbor is inserted, so that the disk of sheetmetal rests against the collar 13 or the forward end of the sleeve 14. A guide collar 15 is now placed on the end 11 of t e arbor, and the arbor and sheet metal are drawn through a hole'in the die-plate of a draw-bench to partially form the disk into a tube. By drawing the arbor and the sheet metal through successively smaller holes the sheet metal is formed into the tube 17, as is shown in Fig. 2, the forward end of the tube being provided with a perforated disk of the thickness of the original disk, while the walls of the tube are much thinner. NVhen the sleeves 14 are used, the perforated dis-k of sheet metal bears against the forward end of the sleeve let. The. first sleeve 14 used is ofmuch greater diameter than the collar 13, so that the tube first formed may be .of any required diameter, and-by gradually changing the sleeve let to one of less diameter, and drawing the sheet metal and arbor through holes of successively less diameter, the tube 18 is at last drawn on a sleeve of the diameter of the collar 13, as is shown in Fig. 6, in which the tube 18 has still at itsiforward end a perforated disk of practically the thickness of the original disk of sheet metal. By the use of this arbor the strain is exerted on the central portion of the metal forming partof the original disk, and the drawing out of the seamless tube is'et'fected by the strain on this end, greatly facilitating the drawing of the tube.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In an arbor adapted for drawing seamless tubes, the combination, with a draw-bar, of a collar forming a shoulder for holding the metal against the strain of the draw-plate, as decri-bed.

.2. In anarbor adapted for drawing seamless tubes, the combination, with the draw-bar and a collar forming a shoulder, of a guidecollar detachably securedon the draw-bar infront .of the metal to be drawn, as described. The combination, .with a draw-bar and a collar forming a shoulder, of a tubularsleeve inclosing thedraw-bar and forming a cylindrical extension of the collar of the same or greater diameter than the collar, as described. 4. The combination, with aidrawebar provided with acylindrical portion of larger diameter than the rest of the draw-bar, ot' a cylindrical sleeve fitting over aportion of the draw-bar, the forward end of the draw-bar projecting beyond the sleeve, as described.

5. The combination, with the draw-bar 10, the collar 13, and the guide-collar 15, as described.

.6. The combination, with the draw-bar 10, the collar 13, and the detachable sleeve 14, as described.

GEORGE U. MEYER.

Witnesses:

J. A. MILLER, Jr., HENRY J. MILLER. 

